This tutorial explains 3 methods to change the hostname of your Linux machine.
Check the current hostname
You can use
Change Hostname: Method1
Hostname is configured in
/etc/hostname file. So we can manually open this file and change hostname there.
sudo nano /etc/hostname
Delete the current name in this file and enter a new hostname for your Linux box. Save and close this file.
Check hostname again with
hostnamectl command and you will see hostname has changed. If you open a new terminal window, you will also notice the hostname has changed. The new hostname is preserved across system reboots with this method.
Update /etc/hosts file
Another thing we need to do is to update
sudo nano /etc/hosts
Just replace the old hostname with the new hostname. Note that Linux is case sensitive. Then save and close this file.
If you don’t update
/etc/hosts file, some programs such as
sudo don’t know how to resolve the new hostname.
If you change the hostname of a Internet-facing Linux server, the new hostname should resolve to public IP address. If you change the hostname of a Debian or Ubuntu home computer, then the new hostname should resolve to 127.0.1.1.
The Debian installer create
127.0.1.1 <host_name> entry for a system without a permanent IP address. For a system with a permanent IP address, 127.0.1.1 should be replaced by the permanent IP address. 127.0.1.1 uses the loopback interface. In fact, 127.0.0.0/8 (127.0.0.0 ~ 127.255.255.255) is all bound to the loopback interface.
Method 2: Change Hostname with hostnamectl
sudo hostnamectl set-hostname <newhostname>
This command will remove the old hostname from
/etc/hostname and put the new hostname in its place. As with the first method, we need to update
Method3: Change Hostname Temporarily
To temporarily change hostname (lost after reboot), use hostname command:
sudo hostname <new-hostname>
This command won’t change the static hostname in
/etc/hostname file. It only changes the transient hostname, so the new hostname won’t be preserved across reboots.
The static hostname is stored in
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